CCTV Review

Question 1

Analog cameras cannot be used on a DVR True or False

Answer 1

False

Question 2

The video standard for Canada is….

a. PAL
b. NTSC
c. NTSC-Canada
d. S-Video

Answer 2

b. NTSC

Question 3

Which camera is better suited for low light conditions?

a. CCD
b. CMOS
c. DSP
d. FFL

Answer 3

a. CCD

Question 4

What is the focal length of the human eye?

a. 7mm
b. 10mm
c. 13mm
d. 17mm

Answer 4

d. 17mm

Question 5

What are the two scanning methods used in the camera and monitor video scanning process?

Answer 5

Raster and Progressive

Question 6

What are the two types of light sources?

Answer 6

Natural and Artificial

Question 7

What is the most common type of lens used in video security applications?

Answer 7

FFL

Question 8

What are the four items required for a simple video system?

Answer 8

lens, monitor, camera, transmission

Question 9

What is the major reason for video surveillance systems?

Answer 9

Protection of people and property (assets)

Question 10

What is the cause of video hum?

Answer 10

grounding differences

Question 11

What is the purpose of the camera’s sensor?

Answer 11

to transmit optical light to electrical signal

Question 12

How many fields are there in one frame of video?

Answer 12

two

Question 13

How many lines per frame does the NTSC television format use?

Answer 13

525

Question 14

Define the five basic switcher types:

Answer 14

Homing, Bridging, Looping, Alarming, Manual

Question 15

What is the difference between a video monitor and a television?

Answer 15

A television has tuners; a monitor does not.

Question 16

Should an aluminum foil-type coax be used for cctv?

Answer 16

Never

Question 17

What are some advantages a DVR has versus an analog recorder?

Answer 17

Faster to review, better picture quality, more storage, password protection, less mati

Question 18

Define the following multiplexers:

a. Simplex
b. Duplex
c. Triplex

Answer 18

a. Simplex: One at a time Record
b. Duplex: Two at a time Review
c. Triplex: Three at a time Live View

Question 19

What determines the light gathering ability of the lens?

Answer 19

Diameter of the optics

Question 20

What are the three most common types of flat panel monitors?

Answer 20

LCD, LED, Plasma

Question 21

What are the colors used to generate an image on a CRT monitor?

Answer 21

Red, blue and green

Question 22

What piece of equipment is used to display four cameras on a single monitor?

Answer 22

Quad splitter

Question 23

How is a DVR different from an NVR?

Answer 23

DVR has limited capacity while the NVR (Network Remote Access) has a much larger capacity.

Question 24

What is the difference between an analog matrix switch and a virtual matrix switch?

Answer 24

An analog matrix switch is when the components are switched by hand; the virtual is all on computer.

Question 25

How does the day/night camera change to provide the best image for varying light conditions?

Answer 25

Use monochrome at night

Question 26

What is the difference between a digital camera and an IP camera?

Answer 26

A digital camera is managed on a DVR and uses overcoax or UTP filter; the IP camera is managed over the network and on the Cat only)

Question 27

What lens type is most like the human eye?

Answer 27

FFL - auto iris the answer depends on sensor size and viewfinder magnification, but the answer ends up being about 50mm for most full frame

Question 28

Define one FtCd of illumination.

Answer 28

Amount of light viewed from one candle at one foot

Question 29

Can you use a lens listed for use on a 1/4" sensor on a 1/2" sensor? Why or why not?

Answer 29

No - the picture would be smaller than the sensor

Question 30

What lux level is considered to be a low light level?

Answer 30

Below .1075 lux

Question 31

Define a virtual matrix switch

Answer 31

A router for cameras and monitors - computer based

Question 32

What are some of the things that will affect the quality of a video image?

Answer 32

distance, wire methods, camera type, lens used, recording device, lighting

Question 33

What is the difference between an analog camera and a digital camera?

Answer 33

An analog camera uses an electrical signal and film, while the digital camera converts image to data, which can be copied, shared, manipulated and stored, indefinitely, with zero image corruption.

Question 34

The sensitivity of a camera is measured in what?

Answer 34

lux

Question 35

What purpose do transmitters and receivers serve?

Answer 35

Transmitters balance the signal for transmission to an electrical signal. Receivers unbalances the signal for display to a video signal.